Detailed
information for reference 33907
Knight, J.B., L.R. Cox, A.M. Keen, R.L. Batten, E.L. Yochelson, and R. Robertson (1960) Systematic Descriptions. In: Moore, R.C. (ed.) Treatise on Invertebrate Paleontology, Part I, Mollusca 1. Geological Society of America and University of Kansas Press. , figs. 89-205.
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